. >> reporter: betsy, once part of armstrong's inner circle with her husband, a former teammate, is one of armstrong's most vocal critics. >> there were a lot of people he hurt and a lot of people he tried to destroy. >> reporter: she testified under oath she heard armstrong admit to doping while being treated for cancer in 1996. >> lance is taking the first step, and it's a big step, but it has to be followed up with the whole, complete, unadulterated truth. >> reporter: on the streets of los angeles, few were surprised by his admission but hoped his cancer foundation would survive. >> the good work they are doing shouldn't be undone because of the actions of one person. >> reporter: this week, the justice department is expected to decide whether to join a whistle blower lawsuit brought by an admitted doper and former teammate of armstrong. landis claims armstrong defrauded the u.s. postal service, a temp sponsor, by using performance-enhancing drugs. thomas weisel was a co-owner of the team. >> the case that floyd landis has brought is against lance armstrong, but also against the tea